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Clutch Size in the Dotterel Charadrius morinellus: An Adaptation to Parental Incubation Behaviour?

John Atle Kålås and Lars Løfaldli
Ornis Scandinavica (Scandinavian Journal of Ornithology)
Vol. 18, No. 4 (Nov., 1987), pp. 316-319
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3676902
Stable URL: http://www.jstor.org/stable/3676902
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Clutch Size in the Dotterel Charadrius morinellus: An Adaptation to Parental Incubation Behaviour?
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Abstract

Effects of experimental clutch enlargement on weight change and incubation schedules of individual incubating male Dotterels were measured. Two birds which were in good physical condition when the experiment started, rapidly lost weight. They also took more frequent periods off the nest, while the average length of these periods changed only slightly. Two birds in poor physical condition (> 10% lighter than average) had a low attendance even on 3-egg clutches, leaving few times each day but for longer periods. An increase in clutch size is one of these nests did not alter this incubation schedule. These data indicate that the 3-egg clutch of the Dotterel has evolved as a compromise between a high incubation constancy and the energy demands of the single incubating male.

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